Stealthy: Secret Messenger - Chat anonymously with friends & strangers
Aboardly - IFTTT for automated customer emailing
Vuash - Send secret messages safely.
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Phonebot - Make phone calls from within a Slack channel
Customerjet - Resolve live chats faster by watching where users get stuck